We propose a new method to measure the coherence time of superconducting phase qubits based on the analysis of the magnetic-field dependent dc nonlinear Andreev current across a high-resistance tunnel contact between the qubit and a dirty metal wire and derive a quantitative relation between the subgap I-V characteristic and the internal correlation function of the qubit.
@article{arxiv.cond-mat/9910506,
title = {Andreev Spectroscopy for Superconducting Phase Qubits},
author = {Mikhail V. Feigel'man and Lev B. Ioffe and Vadim B. Geshkenbein and Gianni Blatter},
journal= {arXiv preprint arXiv:cond-mat/9910506},
year = {2007}
}
Comments
LaTeX 2.09, 11 pages, 2 eps-figures; special LaTeX style file included. Contribution to the Proceedings of "Electron Transport In Mesoscopic Systems", LT22 Satellite Conference in Goteborg, Sweden, 12-15 August 1999. To be published in a special issue of J. Low Temp. Phys. The corresponding Extended Abstract (2 pages) was posted previously at cond-mat/9907317